To complete the data basis for comparing the thermal behaviour of end-member olivines containing cations of the transition element series Mn (3d5), Fe (3d6), Co (3d7), Ni (3d8 subshell) the thermal expansivity of Co and Ni olivines has been studied by X-ray powder diffraction at ambient pressure and temperatures between 25 °C and 1000 °C. The anisotropy of the thermal expansion was analysed using the Kumar isothermal equation-of-state (EoS) coupled with the thermal Mie-Grüneisen EoS. For Co olivine, in order to stabilize the refinement of the EoS coefficients, our thermal expansion data were combined in a simultaneous fit with published P(a, b, c, V) and axial and bulk KT (T) data. This reduced correlations between parameters considerably. Analogous pressure and moduli data for Ni olivine are lacking so that only unit-cell data could be fitted. The volume-related EoS coefficients of Co olivine are 143.7(3) GPa, , , Å3 with the acoustic Debye temperature fixed at 551 K. Axial expansivities α are controlled by compressibilities βT and thermal pressures (∂P/∂T)V according to α = βT (∂P/∂T)V. For olivines, the structural features suggest a sequence of compressibilities with βT,b > βT,c > βT,a (SG Pbnm). Usually, a similar ranking is also found for the axial expansivities. In the case of olivines, however, only Mn olivine meets the expectation, contrary to Fe olivine and to a lesser extent to Co and Ni olivine. The reason for the unusual behaviour is found in the specific anisotropies of the axial thermal pressures. Extrapolation of thermal expansivities and of linear and bulk moduli is justified up to 2200 K, judged from the fulfillment of the relations and .
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Research Article|
March 01, 2019
Thermal expansion and thermal pressure in Co and Ni olivines: A comparison with Mn and Fe olivines
Herbert Kroll;
1
Institut für Mineralogie, Westfälische Wilhelms-Universität
, Corrensstr. 24, 48149Münster, Germany
Corresponding author, e-mail: kroll@nwz.uni-muenster.de
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Peter Schmid-Beurmann;
Peter Schmid-Beurmann
1
Institut für Mineralogie, Westfälische Wilhelms-Universität
, Corrensstr. 24, 48149Münster, Germany
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Alexander Sell;
Alexander Sell
1
Institut für Mineralogie, Westfälische Wilhelms-Universität
, Corrensstr. 24, 48149Münster, Germany
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Julia Büscher;
Julia Büscher
1
Institut für Mineralogie, Westfälische Wilhelms-Universität
, Corrensstr. 24, 48149Münster, Germany
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Robin Dohr;
Robin Dohr
1
Institut für Mineralogie, Westfälische Wilhelms-Universität
, Corrensstr. 24, 48149Münster, Germany
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Armin Kirfel
Armin Kirfel
2
Steinmann Institut
, Poppelsdorfer Schloss, 53115Bonn, Germany
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1
Institut für Mineralogie, Westfälische Wilhelms-Universität
, Corrensstr. 24, 48149Münster, Germany
Peter Schmid-Beurmann
1
Institut für Mineralogie, Westfälische Wilhelms-Universität
, Corrensstr. 24, 48149Münster, Germany
Alexander Sell
1
Institut für Mineralogie, Westfälische Wilhelms-Universität
, Corrensstr. 24, 48149Münster, Germany
Julia Büscher
1
Institut für Mineralogie, Westfälische Wilhelms-Universität
, Corrensstr. 24, 48149Münster, Germany
Robin Dohr
1
Institut für Mineralogie, Westfälische Wilhelms-Universität
, Corrensstr. 24, 48149Münster, Germany
Armin Kirfel
2
Steinmann Institut
, Poppelsdorfer Schloss, 53115Bonn, Germany
Corresponding author, e-mail: kroll@nwz.uni-muenster.de
Publisher: Deutsche Mineralogische Gesellschaft, Sociedad Española de Mineralogia, Societá Italiana di Mineralogia e Petrologia, Société Francaise de Minéralogie
Received:
28 May 2018
Revision Received:
24 Aug 2018
Accepted:
26 Aug 2018
First Online:
04 Apr 2019
Online ISSN: 1617-4011
Print ISSN: 0935-1221
© 2019 E. Schweizerbart’sche Verlagsbuchhandlung, 70176 Stuttgart, Germany
European Journal of Mineralogy (2019) 31 (2): 313–324.
Article history
Received:
28 May 2018
Revision Received:
24 Aug 2018
Accepted:
26 Aug 2018
First Online:
04 Apr 2019
Citation
Herbert Kroll, Peter Schmid-Beurmann, Alexander Sell, Julia Büscher, Robin Dohr, Armin Kirfel; Thermal expansion and thermal pressure in Co and Ni olivines: A comparison with Mn and Fe olivines. European Journal of Mineralogy 2019;; 31 (2): 313–324. doi: https://doi.org/10.1127/ejm/2019/0031-2805
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Index Terms/Descriptors
- bulk modulus
- cell dimensions
- cobalt
- compressibility
- elastic constants
- equations of state
- high temperature
- iron
- manganese
- metals
- nesosilicates
- nickel
- olivine
- olivine group
- orthosilicates
- pressure
- refinement
- silicates
- synthesis
- temperature
- thermal expansion
- thermal properties
- volume
- X-ray diffraction data
- thermal pressure
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